Alarm-clock.



Patented lune 27, |899.

No. 627,90I.

J, H. BRYANS.

ALARM CLOCK.

(Application led Aug. 24, 1897.)

(No Model.)

' mechanism and its connections with the clock Inechanism.

l arms to sound or silence the alarm. Fig.

UNITED STATES' PATENT OFFICE.

JAMES II. BnYANs, or wooDINE, Iowa.

ALARM-CLOCK'.

i SPECIFICATION forming part er Letters Patent No. 627,901, dated rune27, Iseo.

Application filed August 24, 1897.

To all whom 'it 'i/trty/ concer/r.-

Be it known that I, JAMES H. BRYANS, of Vvvoodbine, in the county ofHarrison and State of Iowa, have invented certain new'and usefulImprovements in Alarms for Clocks; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

My invention relates to new and useful improvements in alarm mechanismfor clocks.

The primary object of the invention is .to provide a mechanism of thischaracter that will be especially simple in construction, durable,economical, and efficient in operation.

The invention consists in a novel combination and arrangement of simpleparts, that will be hereinafter fully described and the points ofnovelty set forth in the claims.

Figure 1 is a front elevation of the alarm mechanism. Fig. 2 is a topplan view of said Fig. 3 is a detail perspective view of the wheelforming part of the alarm mechanism. Fig. 4 is a similar view of thewheel for locking and releasing the pivoted 5 is a perspective view ofthe pivoted arms forming a portion of my improved mechanism, looking atthe rear sides thereof. Fig. 6 is an enlarged detail showing the notchedpawl 17 and the end of arm l5.

Referring to the drawings, the numeral I indicates a frame in which isjournaled in suitable bearings the usual spring-actuated winding-shaft2, with means on the end thereof to wind the spring. YMounted upon saidshaft and gearing with a pinion 3 is a gearwheel et. 'The numeral 5indicates a gearwheel keyed to the pinion 3 on shaft 3 and adapted tomesh with a pinion 5 on shaft b', upon which is also mounted anescapementwheel 7, having the usual operative connection with the hammer8.

The above-described mechanism, it will be noted, is of commonconstruction, and I will now proceed to describe the parts of themechanism wherein my invention lies.

Keyed lto the shaft 3 on the outside of the frame I provide a wheel 8',cut away at one side and` formed with a radially-extending Serial No649,339. (No model.)

,its outer end 'and on the inner side thereof a spring-actuated pawl 17,formed with an arm 18, bent inward, and teeth and notches on its lowerside, and said teeth are adapted to be engaged by a pawl 20, pivotallysecured to the lower arm 16. The said arm 1G is formed with an extensionon the end thereof, perforated for the reception of the hook formed onthe lower end of an operating-rod 21, connecting the alarm mechanismwith the clock mechanism, which operates said alarm mechanism and maycause the same to b e silenced,y as will more plainly appear from thedescription of the operation.

In the present instance the clock mechan ism which I employ to actuatethe alarm mechanism is very simple, the same consisting of a disk 22,cut away, as indicated by the numeral 23, forming a notch and acam-face, the purpose of which will presently appear. Saiddisk, it willbe noted, is firmly secured to the stem of the hands and adapted to turntherewith, and said disk is adjustable thereon to bring the notch 23 inthe periphery thereof below the end of a lever 24, bent to form a'transverse arm at its forward end and adapted and bent over the upperedge of the frame isl an arm 26, adapted to be engaged by a stoplever27, pivoted to the outside of the frame and adapted to be shifted inronedirection or the other for the purposeof permitting the soundingmechanism to operate or to silence IOO the alarm, as may be desired, andalso to lift the arm 15 and keep the same normally elevated and the pawl17 thereon out of engagement with the notches or" steps 28 and 29 onthewheel 12.

vThe numeral 30 indicates a short laterallyextending arm formed on thearm 15, which is vadapted to be engaged by an extension below the pivotof the stop-lever 27.

Having thus described the mechanism constituting.,r myinvention, I willnow proceed'to describe its operation.

Assuming the transverse arm of the lever 24 to bein the notch 23 in thedisk 22 of the clock mechanism and the pawl 17 on the pivoted arm 15 tobe in engagement with the bottom step or notch on the wheel 12 and thepawl 2O on the end of the arm 16 in engagement with the end of the arm15 just in advance of the notch in the pawl 17 thereon and it is desiredto sound the alarm the disk 22 in revolving will, by reason ot' itscamface, elevate the pivoted arm 24 and, through the medium of theconnecting-rod 21, will lift the lower pivoted arm 16, causing the pawlthereon to lift the pawl 17 on the arm 15 out of the bottom step ornotch of the wheel 12 and cause said pawl to engage the upper step 29.The disk 22 then completes its revolution without affecting the alarmmechanism until the notch 23 is again reached and the pivoted arm fallstherein, when the lower arm 16 will be dropped and the pawl 2O thereonbrought into position to engage the notch between the teeth of the pawl17 on the a'rui 15. The disk meantime revolvingr will ,by reason of thecamface thereon, again exert a pull upon the rod 21, lifting the lowerarm 16 and causing the pawl 17 of the arm 15 to be disengaged from theupper step of the wheel 12 .and bringthe transverse arm 25 on the end ofthe arm 16 into engagement with the under side of the arm 24', attachedto the pallets arbor, thus preventing the alarm from being sounded atthis point; but another revolution of the disk of the clockmechanismwill cause the droparm to enter said notch 2S and permit the lower arm16 to drop, disengaging the transverse arm thereof from therearwardly-extending arm 25 on the pallets arbor and permitting saidarbor to oscillate and sound the alarm. When the lever 27" is rocked inposition to keep the arm 15 normally elevated, it will be observed thatthe alarm will be sounded with each revolution of the disk' of the clockmechanism, representing a' period of time of twelve hours.

Having thus described the invention, wha I claim as new, and desire tosecure byLetters Patent, is*

1. An alarm mechanism forclocks, involving the combination with asuitable tripping device operated by the clock mechanism, of a steppeddisk or wheel, a pivoted arm, a pawl having teeth carried by said arm,asecond arm having a rearwardly-extending projection, a pawl carried bysaid second arm to engage the toothed pawl, a pallets arbor, and an armconneetedfwith the arbor in range of the rearward projection ot' thesecond arm, substantially as described.

2. An alarm mechanism for clocks, involving the combination with asuitable tripping device operated by the clock mechanism, of a steppeddisk or wheel, a pivoted arm, a pawl having teeth carried by said arm,asec- -ond pivoted arm having a rearwardly-extending projection,a pawlcarried by said second arm to engage the toothed pawl, a pallets arborhaving an arm in range with the rearward projection of the second arm,and a stop-lever for holding the primary pivoted arm normally elevated,substantially as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

JAMES H. BRYANS.

Witnesses:

W. N. WATSON, J oHN BARCLAY.

